Answers

2014-07-24T15:37:44+05:30

the study of heart is called cardiology, a heart specialist is called cardiologist.

the heart pumps the blood for us, it beats very fast, and if we run or do any other thing that tires us, our heart beat goes faster because then our body requires more fresh  blood and oxygen.

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2014-07-24T15:56:59+05:30
This image shows the mechanism of heart.... Hope this helps
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